chore: remove Singleton & replace getIApp with getApp (#5514)

src/singletons/helper/GifTimer.cpp

@@ -31,7 +31,7 @@ void GIFTimer::initialize()
 
         this->position_ += GIF_FRAME_LENGTH;
         this->signal.invoke();
-        getIApp()->getWindows()->repaintGifEmotes();
+        getApp()->getWindows()->repaintGifEmotes();
     });
 }
 

src/singletons/helper/LoggingChannel.cpp

@@ -88,7 +88,7 @@ LoggingChannel::LoggingChannel(QString _channelName, QString _platform)
 
     getSettings()->logPath.connect([this](const QString &logPath, auto) {
         this->baseDirectory = logPath.isEmpty()
-                                  ? getIApp()->getPaths().messageLogDirectory
+                                  ? getApp()->getPaths().messageLogDirectory
                                   : logPath;
         this->openLogFile();
     });